A ceasefire (or a truce) is a temporary lull or official halt during a war in which both sides agree to suspend further offensive actions against each other.
In 2152, Andorian Imperial Guard Commander Thy'lek Shran then told him that he was willing negotiate a ceasefire. His one condition was to have the Enterprise's captain, Jonathan Archer negotiate it with Ambassador Soval. (ENT episode: "Cease Fire")
In 2373, Gowron ordered a ceasefire during the Federation-Klingon War of 2372-2373 when a Changeling posing as Martok was exposed and killed. The ceasefire briefly broke down when Ajilon Prime was attacked in the Battle of Ajilon Prime but it was later reinstated. (DS9 episodes: "Apocalypse Rising", "Nor the Battle to the Strong")
In 2233, the Narada's second-in-command, Ayel, then asked the USS Kelvin's captain, Richard Robau to come aboard the Narada to discuss a cease fire. (TOS movie, novelization & comic adaptation: Star Trek)